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- 2 Sheets-Sheet 1. W. E. MAHER.

AIR BRAKE.

No. 433,737. Patented Aug. 5, 1890.

(No Model.)

/ mum/m (No Model.) 2 Sheets-Sheet 2. W. E. MAHER.

AIR BRAKE.

No. 438,737. Patented Aug. 5, 1890.

UNITED STATES PATENT OFFICE.

IVILLIA'M EDWVARI) MAIIER, OF JOHNSON CITY, TENNESSEE, ASSIGNOR OF ONE-HALF TO WILLIAM TOOTIIE, OF NEIV YORK, N. Y.

Al R-BRAKE.

SPECIFICATION forming part of Letters Patent No. 433,737, dated August 5, 1890. Application filed June 5, 1890- Serial No. 354,305. (No model.)

To aZ'Z whom it may concern.-

Be it known that 1, WILLIAM EDWARD MAHER, of Johnson City, Vashington county, Tennessee, have invented new and useful Improvements in Brake and Signal Mechanism for Railway-Oars; and I declare the following to be a full and exact description of the same.

The object of myrinvention is to provide simple means for the automatic. operation of the brakes in case of derailment of the car or one of its trucks; and the invention consists, broadly, of a valve located at a suitable point and controlling the discharge-port of I5 the system of brake and signal pipes, said valve being combined with operating connections leading to the trucks, so that movement of the trucks from the normal position will cause said connections to be drawn upon turning the valve to let the air escape, the

brakes to be applied in the customary manner and a signal to sound.

In the drawings, Figure 1 is a plan View of the frame-work of the car, showing the ordinary braking system of pipes and cylinders with my invention applied. Fig. 2 is a sectional plan view of the operating-valve in normal position and a part of its operatingconnections in dotted lines. Fig. 3 is a sec- 0 tion of the valve in its operated position with the truck displaced;

In the drawings, the letters C O O G indicate, respectively, the main air pipe, the auxiliary or signal air-pipe, the reservoir, and

5 the brake-cylinder, and as these parts may be of any ordinary construction they need not be particularly described, as the general arrangement thereof forms no part of my invention. The main air-pipe O and the signal- 0 pipe 0 are connected by a short pipe at at a pointpreferably in proximity to the line of the trucks, and this short pipe includes avalvecasing 11, provided with a valve A, adapted to rotate therein.

with ports 1 2 3, and the valve has a port 4 The casing is provided passing through from one side to the other, and a second port 5 extending through at right angles to the port 4. Then in normal position there is no communication to the outside air, and the pressure is maintained as usual in the pipes; but when the Valve is turned in one direction or the other from its normal position, as in Fig. 3, one of the portsthe port 4, for instance-aligns with the passages in the two sections of the pipe a, and opens communication to the outside air through the port 5 in the valve and port 3 in the casing. This causes the automatic application of the brakes in the ordinary manner, the escape of the air from the signalpipe operating in like manner the signal. This action of the valve takes place when the car or one of its trucks is derailed, or When the relative positions of the truck and car change. The valve is provided with a crank arm of any suitable shape, which is connected to the truck by a chain or other con nection, as at 6. The valve .lever or arm is connected to each side of the truck, so that the valve will be operated from either side. The valve is provided with the ordinary stops to limit its movement in both directions.

While I have shown the invention as applied to a system of brake and signal pipes operated by the escape of air, it will be understood that I may apply the invention with equally good effect to other well-known systems.

I claim as my invention- In combination with the brake and signal pipes of a brake system, a valve for controlling pressure in both pipes, and an operatingconnection from said valve to the truck, whereby the valve Will be operated When the truck is displaced, the brake applied,-and the signal given.

WVILLIAM EDXVARD MAI-IER.

Witnesses:

THos. D. CARTER,

. GEO. H. FRAZIER. 

